Shaft-shield for centrifugal pumps.



PATENTED SEPT. l, 1903. J. HBDLUND.

. SHAFT SHIELD FOR GEN'IRIPUGAL PUMPS. Y

APPLICATION FILED JUNE Z'll, 1902.

Nb MoDBL.

R 0 T N. E V W UTTED STATES atented september 1, i903.

PATENT OFFICE.

JOHAN HEDLUND, OF STOCKHOLM, SWEDEN.

SPECIFICATION forming part of Letters Patent No. 737,623, datedSeptember' 1, 1903.

Application filed .Tune 27. 1902. Serial No. 113,520. (No model.)

To a/ZZ whom it may concern:

Be itknown that I, JOHAN HEDLUND, a subject of the King of Sweden andNorway, and a resident of Stockholm, Sweden, have invented a new anduseful Improvement in Shaft- Shields for Centrifugal Pumps, of which thefollowing is a specication.

The invention relates to centrifugal pumps, and has for its object theprotection of that part of the wheel-shaft which is located between thewheel and the pump-casing from wear due to abrasive or destructive mate.rials in the liquid or to friction.Y

My invention consists in a detachable sleeve constructed to inclose andso protect that porof the shaft which extends between the wheel and thecasing and more particularly in the construction hereinafter set forth.

In the accompanying drawings, Figure 1 is a transverse section of acentrifugal pump containing my invention. Fig. 2 is a similar section ofmy invention on a larger scale than appears in Fig. 1.

Similar numbers of reference indicate like parts.

1 is the pump-casing, 2 the pump-wheel, and 3 the pumpshaft carrying thewheel 2. The liquid-inlets are at 4. and the discharge at 5. The hub ofthe pump-wheel 2 has an internally-threaded recess '7, which receivesthe threaded end 8 of the sleeve 6. Said end is provided with a flange9, which abuts against the end of the wheel-hub. In the wall of casing 1is an opening which receives the gland 10, which gland has ahollowed-out face 11. When said gland is in place, the opening on theinside of the casing and the hollow in the inner face of the glandtogether form a recess larger in diameter than the shaft 3. Said shaftpasses through the gland 10, which gland becomes practically a part ofthe casing-wall. The sleeve 6 projects into and terminates in the recessaforesaid. Between the end of the gland and a shoulder formed in thesaid recess packing 12 is placed, which packing surrounds the sleeve 6and forms a bearing therefor and also prevents flow of liquid aroundsaid sleeve to the hollow in the gland-face. By this construction thesleeve 6 serves as a shield for the shaft to prevent contact therewithof liquid traversing the pump-chamber.

I claim- 1. The combination of a wheel, a casing having aninwardly-opening recess in its wall, a shaft carrying said wheel andextending int-o and through said recess, a sleeve inclosing said shaftand secured at one end to said wheel and terminating at its other end insaid recess and a bearing forsaid sleeve in said recess, substantiallyas described.

2. The combination of a wheel, a casing having an inwardly-openingrecess in its wall, a shaft carrying said wheel and extending into andthrough said recess, a sleeve inclosing said shaft and secured at oneend to said wheel and terminating atits other end in said recess andpacking within said recess surrounding said sleeve, substantially asdescribed.

3. The combination of the casing 1 having an internally-shoulderedopening in its wall, wheel 2, gland 10, shaft 3 extending through saidgland, sleeve 6 inclosing said shaft, abutting at one end against saidwheel and terminating at its other end in said recess, and packing 12surrounding said sleeve and interposed between said shoulder in saidcasing-opening and said gland, substantially as described.

4. The combination of a wheel, a shaft carrying said wheel, a casing, asleeve inclosing said shaft and extending between said wheel and saidcasing, a bearing for said sleeve in said casing, and means fordetachably connecting said sleeve to said wheel, substantially asdescribed.

5. The combination of awheel having a central recess in its bodyportion, a shaft carrying said wheel, a casing, a sleeve inclosing saidshaft, and a bearing for said sleeve in said casing; the said sleevehaving one end received in said bearing and its other end entering anddetachably secured in said wheel-recess, substantially as described.

6. The combination of a wheel having a central threaded recess in itsbody portion, a name to this specification in the presence of shaftcarrying said Wheel, a easing, a sleeve two subscribing Witnesses.

inclosinv said shaft and haviny a threaded A end to lengage in saidwheel-recess, and a JOHAN HEDLUND' 5 bearing for said sleeve in saidcasing, sub- Vitnesses: 4

stantially as described. WALDEMAR BOMAN,

In testimony whereof I have 'signed my H. RIDDERSTOLPE.

